If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.

Looking around the WWW, it seems no one really knows. I've seen 45gr to 73 gr, with statements that 1:9 is for heavier bullet weights: 60gr to 72gr. My mini14 is 1:9 twist and shoots 55gr and 62gr very well. Barrel thickness, length and harmonics all come into play. So it really comes down to: see what your particular rifle likes. This is a great reason to go shooting.

My 1/9 twist rifles will shoot 50-62 grain bullets just fine with a little less
accuracy from the 50's. I have a Colt with a 1/7 twist and it is particular
to what 50's it will shoot, it will spin the jackets off of Hornady SX and
Sierra Varminters or keyhole them, but Nosler ballistic tips in 50's worked
fine.

What's your BBL lenght?

Originally Posted by nuckldust

I have two AR's with the 1:9 twist is this ok for 50 grain, 55 grain or how does 60 grain do?

If your BBL is 16" 1x9 it will handle up to a 62gr bullet. If it's 18"+ it will handle up to a 77gr bullet. The only time you're going to need a 1x7 or 1x8 twist BBL is when you are shooting a 63gr to 77gr bullet out of a 16" BBL or shorter @ 400+ yards.
I read in some Govt. literature ( I think Army Times ) that said the 1x7 twist was too much twist for the MK262 ( 77gr ) & was recommending that the Army go to a 1x8 twist, but I've also read where GI's say they are getting kills @ 800yds.
I use the same 14.5" 1x7 BBL & ammo they do & I have no problems with it @ 400yds ( the max distance of my range ).

I would almost say to get an aftermarket adjustable trigger or BE VERY
CAREFUL working the AR triggers. The catch on the hammer that sets
up on the trigger is fairly small and if you remove to much surface area
then it will not reset right and could cause an accidental discharge or
slam fires. On the other hand the hardening of the hammer spur is
shallow enough that it is real easy to hone or stone through the hard
area and into the softer metal, then the hammer spur will beat itself
silly and mushroom. Then the trigger reset is worse than the first
scenario. I tried a trigger group that was an unknown used group, it
was mushroomed just slightly and when the hammer reset after the
first shot, it would not release again without opening the gun, it jammed
up everything and is why you need to bench test the trigger group for
function.

Ya where did you get one for 88.00 I want one at that price. Please tell us your source.
knuckledust your fine up to 68gr in 1x9 in 16". I wouldn't go lower then 50 gr for plinking. I have had great succes with 68 gr and lower anything higher and starts to have fly aways.